Ninjutsu is system initially put into
practice for spying
And discovering of secrets, especially political or military information of another country.
Ninjutsu incorporate methods of collecting information, Ninjutsu can also involve training
in cover up, diversion, archery, drug, and explosives.
Practitioners of ninjutsu have been seen as assassins , and have been seen in the public
mind with other behavior that are regard as illegal by present values. Although it was
influenced by Chinese spying techniques and the tactical doctrine of Sun Tzu, ninjutsu
is supposed by its supporter to be of Japanese origin. One account is that the basis of
ninjutsu was taught to a Japanese family who ran away to the mountains after losing a
battle. There they mixed with a lot of people as well as the offspring of immigrants who had fled China. Later, the skills were developed over 300 years to form ninjutsu.
Even though the common view is that ninjutsu is the art of secrecy or craftiness, real
practitioners consider it to mean the art of enduring hardships. The character nin carries
both these meanings, and others. The eighteen disciplines were primary acknowledged in the scrolls of Togakure-ryu,
and they became standard for all Ninjutsu trainings,
The 18 disciplines are:

Ninjutsu
Seishin-teki kyoyo (spiritual improvement)
Taijutsu (unarmed fighting)
Ninja ken (sword fighting)
Bojutsu (staff fighting)
Shurikenjutsu (knife throwing )
Sojutsu (spear fighting)
Naginatajutsu (naginata fighting)
Kusarigamajutsu (chain fighting)
Kayakujutsu (explosives)
Hensojutsu (disguise and impersonation)
Shinobi-iri (stealth and entering methods)
Bajutsu (horsemanship)
Sui-ren (water training)
Boryaku (military strategy)
Choho (espionage)
Intonjutsu (escaping and concealment)
Tenmon (meteorology)
Chi-mon (geography)